Thin film transistor substrate for liquid crystal display

• US 7,768,588 B2
• Filed: 12/22/2006
• Issued: 08/03/2010
• Est. Priority Date: 06/30/2006
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kwon, Jae Chang, Lee, Sun Yong, Lee, Se Eung
• Primary Examiner(s): HAHM, SARAH UH YOUNG
• Application Number:
  US11/643,974
• Publication Number:
  US 20080002083A1
• Time in Patent Office: 1,320 Days
• Field of Search: 349/43, 349/84, 349/104, 349/106, 349/108, 349139-144
• US Class Current: 349/43
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 2201/40 Arrangements for improving the aperture ratio
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements

Abstract

A thin film transistor (TFT) substrate for a liquid crystal display is provided. The thin film transistor substrate includes: a plurality of gate lines and a plurality of data lines that cross each other and define a plurality of sub-pixels; and a plurality of unit pixels in which first and second unit pixels are alternately formed in a direction of the gate lines and first and second unit pixels are formed vertically in a direction of the data lines, wherein the first unit pixel includes three sub-pixels and the first electrodes are slanted with respect to the gate lines and the data lines in each sub-pixel, the second unit pixel includes three sub-pixels and the second electrodes are a slanted with respect to the gate lines and the data lines in each sub-pixel, and the slant of the second electrodes is symmetrical to the slant of the first electrodes.

Claims

1. A thin film transistor (TFT) substrate for a liquid crystal display, comprising:

a plurality of gate lines and a plurality of data lines that cross each other and define a plurality of sub-pixels; and

a plurality of unit pixels including every three sub-pixels along the gate line, in which first and second unit pixels are alternately formed in a direction of the gate lines and the first and the second unit pixels are formed serially in a direction of the data lines,

wherein the three sub-pixels of the first unit pixel include pixel electrodes slanted with respect to the gate lines and the data lines in each sub-pixel, and common electrodes parallel to the pixel electrode to form a first in-lane field together with the pixel electrode,

the three sub-pixels of the second unit pixel include pixel electrodes slanted with respect to the gate lines and the data lines in each sub-pixel, and common electrodes parallel to the pixel electrode to form a second in-plane field together with the pixel electrode, and

all slants of the pixel electrodes of the first unit pixel have a first direction, and all slants of the pixel electrodes of the second unit pixel have a second direction symmetrical to the first direction.

2. The substrate of claim 1, wherein the pixel electrodes of the first unit pixel adjacent vertically along the gate lines have the same slant with respect to the gate lines.

3. The substrate of claim 2, wherein the pixel electrodes of the second unit pixel adjacent vertically along the gate lines have the same slant with respect to the gate lines.

4. The substrate of claim 1, wherein the pixel electrodes of the first unit pixel adjacent vertically along the gate lines have a slant symmetrical about the gate lines.

5. The substrate of claim 4, wherein the pixel electrodes of the second unit pixel adjacent vertically along the gate lines have a slant symmetrical about the gate lines.

6. The substrate of claim 1, wherein the three sub-pixels of the first and second unit pixels are located in the same order.

7. The substrate of claim 1, wherein the three sub-pixels of the first and second unit pixels are located in a symmetrical order to each other.

8. The substrate of claim 1, wherein the three sub-pixels of the first and second unit pixels include red, green, and blue sub-pixels.

9. A liquid crystal display (LCD) comprising:

a TFT substrate having first and second unit pixels that are alternately located in a direction along gate lines and also located serially in a direction along data lines, the first and second unit pixels in a matrix;

a color filter substrate that faces the TFT substrate;

a liquid crystal layer between the TFT substrate and the color filter substrate,

wherein the first unit pixel includes every three sub-pixels along the gate line, pixel electrodes slant with respect to the gate lines and the data lines in each sub-pixel, and common electrodes parallel to the pixel electrodes in each sub-pixel to form a first in-plane field together with the pixel electrodes,

the second unit pixel includes three sub-pixels, pixel electrodes slant with respect to the gate lines and the data lines in each sub-pixel, and common electrodes parallel to the pixel electrodes in each sub-pixel to form a second in-plane field together with the pixel electrodes, and

all slants of the pixel electrodes of the first unit pixel have a first direction, and all slants of the pixel electrodes of the second unit pixel have a second direction symmetrical to the first direction.

10. The LCD of claim 9, wherein the pixel electrodes of the first unit pixel adjacent up and down based on the gate line are formed in the same slant line direction with respect to the gate line.

11. The LCD of claim 10, wherein the pixel electrodes of the second unit pixel adjacent vertically along the gate lines have the same slant with respect to the gate lines.

12. The LCD of claim 9, wherein the pixel electrodes of the first unit pixel adjacent vertically along the gate lines have a slant symmetrical about the gate lines.

13. The LCD of claim 12, wherein the pixel electrodes of the second unit pixel adjacent vertically along the gate lines have a slant symmetrical about the gate lines.

14. The LCD of claim 9, wherein the three sub-pixels of the first and second unit pixels are located in the same order.

15. The LCD of claim 9, wherein the three sub-pixels of the first and second unit pixels are located in a symmetrical order to each other.

16. The substrate of claim 9, wherein the three sub-pixels of the first and second unit pixels include red, green, and blue sub-pixels.